Health & Fitness Last Updated: January 18, 2026 5 min read

BMI Calculator - Body Mass Index

The BMI calculator is a free tool that allows you to calculate your body mass index quickly and accurately. BMI is a globally recognized standard measure used to assess whether a person has a healthy weight in relation to their height.

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Unit System

Understanding Your BMI Results

The Body Mass Index (BMI) is a universally recognized screening tool that helps assess whether you have a healthy weight for your height. It provides a quick snapshot of your weight status and potential health risks.

Quick BMI Reference Guide

  • Below 18.5: Underweight - May indicate malnutrition
  • 18.5 - 24.9: Normal weight - Healthy range
  • 25.0 - 29.9: Overweight - Increased health risk
  • 30.0 and above: Obesity - Significant health risk

Why BMI Matters

Your BMI can indicate potential health risks. Research shows that people with BMI outside the normal range face higher risks of:

  • Heart disease and stroke
  • Type 2 diabetes
  • High blood pressure
  • Certain cancers
  • Sleep apnea
  • Osteoarthritis

BMI Limitations

Important: BMI is a screening tool, not a diagnostic measure. It doesn’t account for:

  1. Muscle mass - Athletes may have high BMI despite low body fat
  2. Age - Older adults may have more body fat at the same BMI
  3. Gender - Women naturally have more body fat than men
  4. Ethnicity - Different populations have varying health risks at the same BMI

When BMI Isn’t Enough

Consider additional measurements like:

  • Waist circumference
  • Body fat percentage
  • Waist-to-hip ratio
  • Overall fitness level

Take Action for Better Health

If Your BMI is High

  • Consult with a healthcare provider
  • Start with small, sustainable diet changes
  • Aim for 150 minutes of moderate exercise weekly
  • Track your progress monthly

If Your BMI is Low

  • Rule out underlying health conditions
  • Focus on nutrient-dense foods
  • Consider strength training to build muscle
  • Consult a nutritionist for a personalized plan

Disclaimer: This calculator provides estimates only. Always consult with a healthcare professional for personalized medical advice.

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